He can be heard calling out in pain in the video - officers are allowed to use force in their duties if necessary

A Met Police officer was allegedly heard to say "you spit and I'll f***ing hurt you" as the man was held on the floor.

The incident happened in Ruislip, west London in September, after officers were said to have rugby-tackled him to the ground.

The moment where the officer punches the man on the floor was captured on video by someone in a building above.

The man is heard calling out in pain as he is restrained.

The witness who filmed the arrest told the Daily Mail: "It looked like he wasn't going anywhere, they already had him face down on the ground. I thought 'can they do that?'

"It went on for quite a while and the man was obviously in pain. One of them put his knee in his back."

A Metropolitan Police spokeswoman said: "Police were called by a member of the public at about 0900hrs on September 30 to shops in Whitby Road to reports of a man who had assaulted two people at the location.

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"Officers attended and carried out a search of the area and identified the man who was the suspect. As officers attempted to arrest him he became violent, and six officers were involved in restraining the man.

"During the course of the arrest one of the officers struck the man on the back a number of times.

"The man was arrested and charged with two counts of common assault after assaulting his wife and a shop keeper who attempted to intervene in the row between the couple. He remains on court bail pending trial.

"A contemporaneous note of the incident by the arresting officer provides an account and rationale for the use of force. An initial review has taken place against the independently shot footage which appears to correspond. This will be further looked into.

"Senior officers at Hillingdon Borough will speak to the officer to review his account with him as soon as he is next on duty.

"To date no complaint has been made. Attempts will be made to contact the man who was charged to see if he wishes to make any complaint about the arrest."

An investigation is underway after footage emerged of a police officer appearing to punch a suspect on the floor during an arrest, in a separate incident.